The iPad is Heavy - Selecting a Reading Stand
While the Kindle DX weighs 1.18 lbs, the iPad weighs 1.5 - 1.6 lbs. I expect that this is going to prove too heavy to hold for most long term casual reading.
Wired reports on this Kickback stand from Scosche (similar to it's iPod Touch stand) but I suspect the Apple integrated case & stand (scroll down) will prove popular. The nice thing about the Kickback promo graphic is that one version provides a portrait reading mode. Obviously, a case/stand that provides both portrait and landscape support will be most desirable.
The iPad's weight is going to be another factor keeping the small Amazon Kindle 2 selling well for a long time.